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Which of the following is not an essential amino acid:

1. Valine
2. Leucine
3. Lysine
4. Tyrosine

Correct answer: Tyrosine

Solution

Tyrosine is classified as a non-essential amino acid because the body can synthesize it from phenylalanine, whereas valine, leucine, and lysine are essential amino acids that must be obtained through diet.

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